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<a name="1" href="#1">1</a>   <em class="jxr_javadoccomment">/**</em>
<a name="2" href="#2">2</a>   <em class="jxr_javadoccomment"> * Copyright 2010 Nicholas Blair, Eric Dalquist</em>
<a name="3" href="#3">3</a>   <em class="jxr_javadoccomment"> *</em>
<a name="4" href="#4">4</a>   <em class="jxr_javadoccomment"> * Licensed under the Apache License, Version 2.0 (the "License");</em>
<a name="5" href="#5">5</a>   <em class="jxr_javadoccomment"> * you may not use this file except in compliance with the License.</em>
<a name="6" href="#6">6</a>   <em class="jxr_javadoccomment"> * You may obtain a copy of the License at</em>
<a name="7" href="#7">7</a>   <em class="jxr_javadoccomment"> *</em>
<a name="8" href="#8">8</a>   <em class="jxr_javadoccomment"> *   <a href="http://www.apache.org/licenses/LICENSE-2.0" target="alexandria_uri">http://www.apache.org/licenses/LICENSE-2.0</a></em>
<a name="9" href="#9">9</a>   <em class="jxr_javadoccomment"> *</em>
<a name="10" href="#10">10</a>  <em class="jxr_javadoccomment"> * Unless required by applicable law or agreed to in writing, software</em>
<a name="11" href="#11">11</a>  <em class="jxr_javadoccomment"> * distributed under the License is distributed on an "AS IS" BASIS,</em>
<a name="12" href="#12">12</a>  <em class="jxr_javadoccomment"> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.</em>
<a name="13" href="#13">13</a>  <em class="jxr_javadoccomment"> * See the License for the specific language governing permissions and</em>
<a name="14" href="#14">14</a>  <em class="jxr_javadoccomment"> * limitations under the License.</em>
<a name="15" href="#15">15</a>  <em class="jxr_javadoccomment"> */</em>
<a name="16" href="#16">16</a>  
<a name="17" href="#17">17</a>  <strong class="jxr_keyword">package</strong> com.googlecode.ehcache.annotations.key;
<a name="18" href="#18">18</a>  
<a name="19" href="#19">19</a>  <strong class="jxr_keyword">import</strong> java.io.DataOutputStream;
<a name="20" href="#20">20</a>  <strong class="jxr_keyword">import</strong> java.io.IOException;
<a name="21" href="#21">21</a>  <strong class="jxr_keyword">import</strong> java.lang.reflect.Array;
<a name="22" href="#22">22</a>  <strong class="jxr_keyword">import</strong> java.security.MessageDigest;
<a name="23" href="#23">23</a>  <strong class="jxr_keyword">import</strong> java.security.NoSuchAlgorithmException;
<a name="24" href="#24">24</a>  <strong class="jxr_keyword">import</strong> java.util.Map;
<a name="25" href="#25">25</a>  
<a name="26" href="#26">26</a>  <strong class="jxr_keyword">import</strong> org.apache.commons.codec.binary.Base64;
<a name="27" href="#27">27</a>  <strong class="jxr_keyword">import</strong> org.slf4j.Logger;
<a name="28" href="#28">28</a>  <strong class="jxr_keyword">import</strong> org.slf4j.LoggerFactory;
<a name="29" href="#29">29</a>  
<a name="30" href="#30">30</a>  <em class="jxr_javadoccomment">/**</em>
<a name="31" href="#31">31</a>  <em class="jxr_javadoccomment"> * This key generator is a good option when a secure hash of the arguments is needed or when a</em>
<a name="32" href="#32">32</a>  <em class="jxr_javadoccomment"> * larger final key space is desired. As with {@link HashCodeCacheKeyGenerator} the argument</em>
<a name="33" href="#33">33</a>  <em class="jxr_javadoccomment"> * hashCode is used for key generation data but instead of the simple Java hash algorithm being</em>
<a name="34" href="#34">34</a>  <em class="jxr_javadoccomment"> * used any {@link MessageDigest} can be used, SHA-1 is used by default. The generated hash is</em>
<a name="35" href="#35">35</a>  <em class="jxr_javadoccomment"> * base64 encoded using {@link Base64#encodeBase64URLSafeString(byte[])}</em>
<a name="36" href="#36">36</a>  <em class="jxr_javadoccomment"> * </em>
<a name="37" href="#37">37</a>  <em class="jxr_javadoccomment"> * &lt;table&gt;</em>
<a name="38" href="#38">38</a>  <em class="jxr_javadoccomment"> *  &lt;tr&gt;</em>
<a name="39" href="#39">39</a>  <em class="jxr_javadoccomment"> *      &lt;th&gt;Pros&lt;/th&gt;</em>
<a name="40" href="#40">40</a>  <em class="jxr_javadoccomment"> *      &lt;th&gt;Cons&lt;/th&gt;</em>
<a name="41" href="#41">41</a>  <em class="jxr_javadoccomment"> *  &lt;/tr&gt;</em>
<a name="42" href="#42">42</a>  <em class="jxr_javadoccomment"> *  &lt;tr&gt;</em>
<a name="43" href="#43">43</a>  <em class="jxr_javadoccomment"> *      &lt;td&gt;</em>
<a name="44" href="#44">44</a>  <em class="jxr_javadoccomment"> *          Better assurance than {@link HashCodeCacheKeyGenerator} against key collisions though</em>
<a name="45" href="#45">45</a>  <em class="jxr_javadoccomment"> *          with the argument hashCodes being the source of the data it is still not perfect.</em>
<a name="46" href="#46">46</a>  <em class="jxr_javadoccomment"> *      &lt;/td&gt;</em>
<a name="47" href="#47">47</a>  <em class="jxr_javadoccomment"> *      &lt;td&gt;</em>
<a name="48" href="#48">48</a>  <em class="jxr_javadoccomment"> *          Slower than {@link HashCodeCacheKeyGenerator}</em>
<a name="49" href="#49">49</a>  <em class="jxr_javadoccomment"> *      &lt;/td&gt;</em>
<a name="50" href="#50">50</a>  <em class="jxr_javadoccomment"> *  &lt;/tr&gt;</em>
<a name="51" href="#51">51</a>  <em class="jxr_javadoccomment"> * &lt;/table&gt;</em>
<a name="52" href="#52">52</a>  <em class="jxr_javadoccomment"> * </em>
<a name="53" href="#53">53</a>  <em class="jxr_javadoccomment"> * @author Eric Dalquist</em>
<a name="54" href="#54">54</a>  <em class="jxr_javadoccomment"> * @version $Revision: 332 $</em>
<a name="55" href="#55">55</a>  <em class="jxr_javadoccomment"> */</em>
<a name="56" href="#56">56</a>  <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">class</strong> <a href="../../../../../com/googlecode/ehcache/annotations/key/MessageDigestCacheKeyGenerator.html">MessageDigestCacheKeyGenerator</a> <strong class="jxr_keyword">extends</strong> AbstractCacheKeyGenerator&lt;String&gt; {
<a name="57" href="#57">57</a>      <em class="jxr_javadoccomment">/**</em>
<a name="58" href="#58">58</a>  <em class="jxr_javadoccomment">     * Name of the bean this generator is registered under using the default constructor.</em>
<a name="59" href="#59">59</a>  <em class="jxr_javadoccomment">     */</em>
<a name="60" href="#60">60</a>      <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> String DEFAULT_BEAN_NAME = <span class="jxr_string">"com.googlecode.ehcache.annotations.key.MessageDigestCacheKeyGenerator.DEFAULT_BEAN_NAME"</span>;
<a name="61" href="#61">61</a>      
<a name="62" href="#62">62</a>      <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> String DEFAULT_ALGORITHM = <span class="jxr_string">"SHA-1"</span>;
<a name="63" href="#63">63</a>      <strong class="jxr_keyword">protected</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> <strong class="jxr_keyword">int</strong> DEFAULT_BYTE_BUFFER_SIZE = 64;
<a name="64" href="#64">64</a>      
<a name="65" href="#65">65</a>      <strong class="jxr_keyword">protected</strong> <strong class="jxr_keyword">final</strong> Logger logger = LoggerFactory.getLogger(<strong class="jxr_keyword">this</strong>.getClass());
<a name="66" href="#66">66</a>      
<a name="67" href="#67">67</a>      <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">final</strong> MessageDigest baseMessageDigest;
<a name="68" href="#68">68</a>      <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">boolean</strong> cloneNotSupported;
<a name="69" href="#69">69</a>      
<a name="70" href="#70">70</a>      <em class="jxr_javadoccomment">/**</em>
<a name="71" href="#71">71</a>  <em class="jxr_javadoccomment">     * Uses {@link #DEFAULT_ALGORITHM} for the algorithm</em>
<a name="72" href="#72">72</a>  <em class="jxr_javadoccomment">     * @see AbstractCacheKeyGenerator#AbstractCacheKeyGenerator() </em>
<a name="73" href="#73">73</a>  <em class="jxr_javadoccomment">     */</em>
<a name="74" href="#74">74</a>      <strong class="jxr_keyword">public</strong> <a href="../../../../../com/googlecode/ehcache/annotations/key/MessageDigestCacheKeyGenerator.html">MessageDigestCacheKeyGenerator</a>() <strong class="jxr_keyword">throws</strong> NoSuchAlgorithmException {
<a name="75" href="#75">75</a>          <strong class="jxr_keyword">this</strong>(DEFAULT_ALGORITHM);
<a name="76" href="#76">76</a>      }
<a name="77" href="#77">77</a>      
<a name="78" href="#78">78</a>      <em class="jxr_javadoccomment">/**</em>
<a name="79" href="#79">79</a>  <em class="jxr_javadoccomment">     * @see AbstractCacheKeyGenerator#AbstractCacheKeyGenerator() </em>
<a name="80" href="#80">80</a>  <em class="jxr_javadoccomment">     */</em>
<a name="81" href="#81">81</a>      <strong class="jxr_keyword">public</strong> <a href="../../../../../com/googlecode/ehcache/annotations/key/MessageDigestCacheKeyGenerator.html">MessageDigestCacheKeyGenerator</a>(String algorithm) <strong class="jxr_keyword">throws</strong> NoSuchAlgorithmException {
<a name="82" href="#82">82</a>          <strong class="jxr_keyword">this</strong>.baseMessageDigest = MessageDigest.getInstance(algorithm);
<a name="83" href="#83">83</a>      }
<a name="84" href="#84">84</a>      
<a name="85" href="#85">85</a>      <em class="jxr_javadoccomment">/**</em>
<a name="86" href="#86">86</a>  <em class="jxr_javadoccomment">     * Uses {@link #DEFAULT_ALGORITHM} for the algorithm</em>
<a name="87" href="#87">87</a>  <em class="jxr_javadoccomment">     * @see AbstractCacheKeyGenerator#AbstractCacheKeyGenerator(boolean, boolean) </em>
<a name="88" href="#88">88</a>  <em class="jxr_javadoccomment">     */</em>
<a name="89" href="#89">89</a>      <strong class="jxr_keyword">public</strong> <a href="../../../../../com/googlecode/ehcache/annotations/key/MessageDigestCacheKeyGenerator.html">MessageDigestCacheKeyGenerator</a>(<strong class="jxr_keyword">boolean</strong> includeMethod, <strong class="jxr_keyword">boolean</strong> includeParameterTypes) <strong class="jxr_keyword">throws</strong> NoSuchAlgorithmException {
<a name="90" href="#90">90</a>          <strong class="jxr_keyword">this</strong>(DEFAULT_ALGORITHM, includeMethod, includeParameterTypes);
<a name="91" href="#91">91</a>      }
<a name="92" href="#92">92</a>      
<a name="93" href="#93">93</a>      <em class="jxr_javadoccomment">/**</em>
<a name="94" href="#94">94</a>  <em class="jxr_javadoccomment">     * @see AbstractCacheKeyGenerator#AbstractCacheKeyGenerator(boolean, boolean) </em>
<a name="95" href="#95">95</a>  <em class="jxr_javadoccomment">     */</em>
<a name="96" href="#96">96</a>      <strong class="jxr_keyword">public</strong> <a href="../../../../../com/googlecode/ehcache/annotations/key/MessageDigestCacheKeyGenerator.html">MessageDigestCacheKeyGenerator</a>(String algorithm, <strong class="jxr_keyword">boolean</strong> includeMethod, <strong class="jxr_keyword">boolean</strong> includeParameterTypes) <strong class="jxr_keyword">throws</strong> NoSuchAlgorithmException {
<a name="97" href="#97">97</a>          <strong class="jxr_keyword">super</strong>(includeMethod, includeParameterTypes);
<a name="98" href="#98">98</a>          <strong class="jxr_keyword">this</strong>.baseMessageDigest = MessageDigest.getInstance(algorithm);
<a name="99" href="#99">99</a>      }
<a name="100" href="#100">100</a>     
<a name="101" href="#101">101</a> 
<a name="102" href="#102">102</a>     @Override
<a name="103" href="#103">103</a>     <strong class="jxr_keyword">public</strong> String generateKey(Object... data) {
<a name="104" href="#104">104</a>         <strong class="jxr_keyword">final</strong> MessageDigest messageDigest = <strong class="jxr_keyword">this</strong>.getMessageDigest();
<a name="105" href="#105">105</a>         
<a name="106" href="#106">106</a>         <strong class="jxr_keyword">final</strong> <a href="../../../../../com/googlecode/ehcache/annotations/key/MessageDigestOutputStream.html">MessageDigestOutputStream</a> messageDigestOutputStream = <strong class="jxr_keyword">new</strong> <a href="../../../../../com/googlecode/ehcache/annotations/key/MessageDigestOutputStream.html">MessageDigestOutputStream</a>(messageDigest);
<a name="107" href="#107">107</a>         <strong class="jxr_keyword">final</strong> DataOutputStream dataOutputStream = <strong class="jxr_keyword">new</strong> DataOutputStream(messageDigestOutputStream);
<a name="108" href="#108">108</a>         
<a name="109" href="#109">109</a>         <strong class="jxr_keyword">try</strong> {
<a name="110" href="#110">110</a>             <strong class="jxr_keyword">this</strong>.deepDigest(dataOutputStream, data);
<a name="111" href="#111">111</a>         }
<a name="112" href="#112">112</a>         <strong class="jxr_keyword">catch</strong> (IOException ioe) {
<a name="113" href="#113">113</a>             <strong class="jxr_keyword">throw</strong> <strong class="jxr_keyword">new</strong> IllegalStateException(<span class="jxr_string">"IOExceptions should not be possible from this key generator"</span>);
<a name="114" href="#114">114</a>         }
<a name="115" href="#115">115</a> 
<a name="116" href="#116">116</a>         <strong class="jxr_keyword">final</strong> byte[] digest = messageDigest.digest();
<a name="117" href="#117">117</a>         <strong class="jxr_keyword">return</strong> <strong class="jxr_keyword">this</strong>.encodeHash(digest);
<a name="118" href="#118">118</a>     }
<a name="119" href="#119">119</a> 
<a name="120" href="#120">120</a>     <em class="jxr_javadoccomment">/**</em>
<a name="121" href="#121">121</a> <em class="jxr_javadoccomment">     * Encode the digested hash bytes as a String</em>
<a name="122" href="#122">122</a> <em class="jxr_javadoccomment">     */</em>
<a name="123" href="#123">123</a>     <strong class="jxr_keyword">protected</strong> String encodeHash(<strong class="jxr_keyword">final</strong> byte[] digest) {
<a name="124" href="#124">124</a>         <strong class="jxr_keyword">return</strong> Base64.encodeBase64URLSafeString(digest);
<a name="125" href="#125">125</a>     }
<a name="126" href="#126">126</a> 
<a name="127" href="#127">127</a>     <em class="jxr_javadoccomment">/**</em>
<a name="128" href="#128">128</a> <em class="jxr_javadoccomment">     * Tries to clone the {@link MessageDigest} that was created during construction. If the clone fails</em>
<a name="129" href="#129">129</a> <em class="jxr_javadoccomment">     * that is remembered and from that point on new {@link MessageDigest} instances will be created on</em>
<a name="130" href="#130">130</a> <em class="jxr_javadoccomment">     * every call.</em>
<a name="131" href="#131">131</a> <em class="jxr_javadoccomment">     * </em>
<a name="132" href="#132">132</a> <em class="jxr_javadoccomment">     * @return Generates a {@link MessageDigest} to use during a call to {@link #generateKey(Object...)}</em>
<a name="133" href="#133">133</a> <em class="jxr_javadoccomment">     */</em>
<a name="134" href="#134">134</a>     <strong class="jxr_keyword">protected</strong> MessageDigest getMessageDigest() {
<a name="135" href="#135">135</a>         <strong class="jxr_keyword">if</strong> (<strong class="jxr_keyword">this</strong>.cloneNotSupported) {
<a name="136" href="#136">136</a>             <strong class="jxr_keyword">final</strong> String algorithm = <strong class="jxr_keyword">this</strong>.baseMessageDigest.getAlgorithm();
<a name="137" href="#137">137</a>             <strong class="jxr_keyword">try</strong> {
<a name="138" href="#138">138</a>                 <strong class="jxr_keyword">return</strong> MessageDigest.getInstance(algorithm);
<a name="139" href="#139">139</a>             }
<a name="140" href="#140">140</a>             <strong class="jxr_keyword">catch</strong> (NoSuchAlgorithmException e) {
<a name="141" href="#141">141</a>                 <strong class="jxr_keyword">throw</strong> <strong class="jxr_keyword">new</strong> IllegalStateException(<span class="jxr_string">"MessageDigest algorithm '"</span> + algorithm + <span class="jxr_string">"' was supported when "</span> + <strong class="jxr_keyword">this</strong>.getClass().getSimpleName() + <span class="jxr_string">" was created but is not now. This should not be possible."</span>, e);
<a name="142" href="#142">142</a>             }
<a name="143" href="#143">143</a>         }
<a name="144" href="#144">144</a>         
<a name="145" href="#145">145</a>         <strong class="jxr_keyword">try</strong> {
<a name="146" href="#146">146</a>             <strong class="jxr_keyword">return</strong> (MessageDigest)<strong class="jxr_keyword">this</strong>.baseMessageDigest.clone();
<a name="147" href="#147">147</a>         }
<a name="148" href="#148">148</a>         <strong class="jxr_keyword">catch</strong> (CloneNotSupportedException e) {
<a name="149" href="#149">149</a>             <strong class="jxr_keyword">this</strong>.cloneNotSupported = <strong class="jxr_keyword">true</strong>;
<a name="150" href="#150">150</a>             <strong class="jxr_keyword">this</strong>.logger.warn(<span class="jxr_string">"Could not clone MessageDigest using algorithm '"</span> + <strong class="jxr_keyword">this</strong>.baseMessageDigest.getAlgorithm() + <span class="jxr_string">"'. MessageDigest.getInstance will be used from now on which will be much more expensive."</span>, e);
<a name="151" href="#151">151</a>             <strong class="jxr_keyword">return</strong> <strong class="jxr_keyword">this</strong>.getMessageDigest();
<a name="152" href="#152">152</a>         }
<a name="153" href="#153">153</a>     }
<a name="154" href="#154">154</a> 
<a name="155" href="#155">155</a>     <em class="jxr_javadoccomment">/**</em>
<a name="156" href="#156">156</a> <em class="jxr_javadoccomment">     * Does a deep traversal, iterating over arrays, collections and maps and map entries. When</em>
<a name="157" href="#157">157</a> <em class="jxr_javadoccomment">     * a leaf in the object graph is found the appropriate digest method is called.</em>
<a name="158" href="#158">158</a> <em class="jxr_javadoccomment">     * </em>
<a name="159" href="#159">159</a> <em class="jxr_javadoccomment">     * If {@link #setCheckforCycles(boolean)} is true and a cycle is found nothing is appended</em>
<a name="160" href="#160">160</a> <em class="jxr_javadoccomment">     * to the {@link MessageDigest} the second time the object is encountered.</em>
<a name="161" href="#161">161</a> <em class="jxr_javadoccomment">     * </em>
<a name="162" href="#162">162</a> <em class="jxr_javadoccomment">     * @param o The object to inspect</em>
<a name="163" href="#163">163</a> <em class="jxr_javadoccomment">     */</em>
<a name="164" href="#164">164</a>     <strong class="jxr_keyword">protected</strong> <strong class="jxr_keyword">final</strong> <strong class="jxr_keyword">void</strong> deepDigest(DataOutputStream dataOutputStream, Object o) <strong class="jxr_keyword">throws</strong> IOException {
<a name="165" href="#165">165</a>         <strong class="jxr_keyword">if</strong> (o == <strong class="jxr_keyword">null</strong> || !register(o)) {
<a name="166" href="#166">166</a>             dataOutputStream.write(0);
<a name="167" href="#167">167</a>             <strong class="jxr_keyword">return</strong>;
<a name="168" href="#168">168</a>         }
<a name="169" href="#169">169</a>         
<a name="170" href="#170">170</a>         <strong class="jxr_keyword">try</strong> {
<a name="171" href="#171">171</a>             <strong class="jxr_keyword">if</strong> (o instanceof Class&lt;?&gt;) {
<a name="172" href="#172">172</a>                 <strong class="jxr_keyword">this</strong>.digest(dataOutputStream, (Class&lt;?&gt;) o);
<a name="173" href="#173">173</a>             }
<a name="174" href="#174">174</a>             <strong class="jxr_keyword">else</strong> <strong class="jxr_keyword">if</strong> (o instanceof Enum&lt;?&gt;) {
<a name="175" href="#175">175</a>                 <strong class="jxr_keyword">this</strong>.digest(dataOutputStream, (Enum&lt;?&gt;) o);
<a name="176" href="#176">176</a>             }
<a name="177" href="#177">177</a>             <strong class="jxr_keyword">else</strong> <strong class="jxr_keyword">if</strong> (o.getClass().isArray()) {
<a name="178" href="#178">178</a>                 <strong class="jxr_keyword">final</strong> <strong class="jxr_keyword">int</strong> length = Array.getLength(o);
<a name="179" href="#179">179</a>                 <strong class="jxr_keyword">for</strong> (<strong class="jxr_keyword">int</strong> index = 0; index &lt; length; index++) {
<a name="180" href="#180">180</a>                     <strong class="jxr_keyword">final</strong> Object arrayValue = Array.get(o, index);
<a name="181" href="#181">181</a>                     <strong class="jxr_keyword">this</strong>.deepDigest(dataOutputStream, arrayValue);
<a name="182" href="#182">182</a>                 }
<a name="183" href="#183">183</a>             }
<a name="184" href="#184">184</a>             <strong class="jxr_keyword">else</strong> <strong class="jxr_keyword">if</strong> (o instanceof Iterable&lt;?&gt;) {
<a name="185" href="#185">185</a>                 <strong class="jxr_keyword">for</strong> (<strong class="jxr_keyword">final</strong> Object e : ((Iterable&lt;?&gt;) o)) {
<a name="186" href="#186">186</a>                     <strong class="jxr_keyword">this</strong>.deepDigest(dataOutputStream, e);
<a name="187" href="#187">187</a>                 }
<a name="188" href="#188">188</a>             }
<a name="189" href="#189">189</a>             <strong class="jxr_keyword">else</strong> <strong class="jxr_keyword">if</strong> (o instanceof Map&lt;?, ?&gt;) {
<a name="190" href="#190">190</a>                 <strong class="jxr_keyword">this</strong>.deepDigest(dataOutputStream, ((Map&lt;?, ?&gt;) o).entrySet());
<a name="191" href="#191">191</a>             }
<a name="192" href="#192">192</a>             <strong class="jxr_keyword">else</strong> <strong class="jxr_keyword">if</strong> (o instanceof Map.Entry&lt;?, ?&gt;) {
<a name="193" href="#193">193</a>                 <strong class="jxr_keyword">final</strong> Map.Entry&lt;?, ?&gt; entry = (Map.Entry&lt;?, ?&gt;) o;
<a name="194" href="#194">194</a>                 <strong class="jxr_keyword">this</strong>.deepDigest(dataOutputStream, entry.getKey());
<a name="195" href="#195">195</a>                 <strong class="jxr_keyword">this</strong>.deepDigest(dataOutputStream, entry.getValue());
<a name="196" href="#196">196</a>             }
<a name="197" href="#197">197</a>             <strong class="jxr_keyword">else</strong> <strong class="jxr_keyword">if</strong> (o instanceof String) {
<a name="198" href="#198">198</a>                 dataOutputStream.writeUTF((String)o);
<a name="199" href="#199">199</a>             }
<a name="200" href="#200">200</a>             <strong class="jxr_keyword">else</strong> <strong class="jxr_keyword">if</strong> (o instanceof Boolean) {
<a name="201" href="#201">201</a>                 dataOutputStream.writeBoolean(((Boolean)o).booleanValue());
<a name="202" href="#202">202</a>             }
<a name="203" href="#203">203</a>             <strong class="jxr_keyword">else</strong> <strong class="jxr_keyword">if</strong> (o instanceof Byte) {
<a name="204" href="#204">204</a>                 dataOutputStream.writeByte(((Byte)o).byteValue());
<a name="205" href="#205">205</a>             }
<a name="206" href="#206">206</a>             <strong class="jxr_keyword">else</strong> <strong class="jxr_keyword">if</strong> (o instanceof Character) {
<a name="207" href="#207">207</a>                 dataOutputStream.writeChar(((Character)o).charValue());
<a name="208" href="#208">208</a>             }
<a name="209" href="#209">209</a>             <strong class="jxr_keyword">else</strong> <strong class="jxr_keyword">if</strong> (o instanceof Double) {
<a name="210" href="#210">210</a>                 dataOutputStream.writeDouble(((Double)o).doubleValue());
<a name="211" href="#211">211</a>             }
<a name="212" href="#212">212</a>             <strong class="jxr_keyword">else</strong> <strong class="jxr_keyword">if</strong> (o instanceof Float) {
<a name="213" href="#213">213</a>                 dataOutputStream.writeFloat(((Float)o).floatValue());
<a name="214" href="#214">214</a>             }
<a name="215" href="#215">215</a>             <strong class="jxr_keyword">else</strong> <strong class="jxr_keyword">if</strong> (o instanceof Integer) {
<a name="216" href="#216">216</a>                 dataOutputStream.writeInt(((Integer)o).intValue());
<a name="217" href="#217">217</a>             }
<a name="218" href="#218">218</a>             <strong class="jxr_keyword">else</strong> <strong class="jxr_keyword">if</strong> (o instanceof Long) {
<a name="219" href="#219">219</a>                 dataOutputStream.writeLong(((Long)o).longValue());
<a name="220" href="#220">220</a>             }
<a name="221" href="#221">221</a>             <strong class="jxr_keyword">else</strong> <strong class="jxr_keyword">if</strong> (o instanceof Short) {
<a name="222" href="#222">222</a>                 dataOutputStream.writeShort(((Short)o).shortValue());
<a name="223" href="#223">223</a>             }
<a name="224" href="#224">224</a>             <strong class="jxr_keyword">else</strong> {
<a name="225" href="#225">225</a>                 <strong class="jxr_keyword">this</strong>.digest(dataOutputStream, o);
<a name="226" href="#226">226</a>             }
<a name="227" href="#227">227</a>         }
<a name="228" href="#228">228</a>         <strong class="jxr_keyword">finally</strong> {
<a name="229" href="#229">229</a>             unregister(o);
<a name="230" href="#230">230</a>         }
<a name="231" href="#231">231</a>     }
<a name="232" href="#232">232</a> 
<a name="233" href="#233">233</a>     <em class="jxr_javadoccomment">/**</em>
<a name="234" href="#234">234</a> <em class="jxr_javadoccomment">     * Special handling for digesting a {@link Class} which does not implement hashCode.</em>
<a name="235" href="#235">235</a> <em class="jxr_javadoccomment">     * </em>
<a name="236" href="#236">236</a> <em class="jxr_javadoccomment">     * Default implementation is to digest {@link Class#getName()}</em>
<a name="237" href="#237">237</a> <em class="jxr_javadoccomment">     */</em>
<a name="238" href="#238">238</a>     <strong class="jxr_keyword">protected</strong> <strong class="jxr_keyword">void</strong> digest(DataOutputStream dataOutputStream, Class&lt;?&gt; c) <strong class="jxr_keyword">throws</strong> IOException {
<a name="239" href="#239">239</a>         <strong class="jxr_keyword">this</strong>.digest(dataOutputStream, c.getName());
<a name="240" href="#240">240</a>     }
<a name="241" href="#241">241</a>     
<a name="242" href="#242">242</a>     <em class="jxr_javadoccomment">/**</em>
<a name="243" href="#243">243</a> <em class="jxr_javadoccomment">     * Generate hash code for an Enum, uses a combination of the Class and name to generate a consistent hash code</em>
<a name="244" href="#244">244</a> <em class="jxr_javadoccomment">     */</em>
<a name="245" href="#245">245</a>     <strong class="jxr_keyword">protected</strong> <strong class="jxr_keyword">void</strong> digest(DataOutputStream dataOutputStream, Enum&lt;?&gt; e) <strong class="jxr_keyword">throws</strong> IOException {
<a name="246" href="#246">246</a>         <strong class="jxr_keyword">this</strong>.deepDigest(dataOutputStream, <strong class="jxr_keyword">new</strong> Object[] { e.getClass(), e.name() });
<a name="247" href="#247">247</a>     }
<a name="248" href="#248">248</a> 
<a name="249" href="#249">249</a>     <em class="jxr_javadoccomment">/**</em>
<a name="250" href="#250">250</a> <em class="jxr_javadoccomment">     * Add an object to the digest. Default adds the object's hashCode to the digest</em>
<a name="251" href="#251">251</a> <em class="jxr_javadoccomment">     */</em>
<a name="252" href="#252">252</a>     <strong class="jxr_keyword">protected</strong> <strong class="jxr_keyword">void</strong> digest(DataOutputStream dataOutputStream, Object o) <strong class="jxr_keyword">throws</strong> IOException {
<a name="253" href="#253">253</a>         dataOutputStream.writeInt(o.hashCode());
<a name="254" href="#254">254</a>     }
<a name="255" href="#255">255</a> }
</pre>
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